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A vertical well with a wellbore radius of 0 . 4 ft has been completed through the top half of the pay zone. The pay
A vertical well with a wellbore radius of ft has been completed through the top half of the pay
zone. The pay zone is ft thick. The perforation density is shotsft and the perforations are
in long, resulting in a perforation skin factor, not considering any damage or other effects, of sp
There also exists a damage zone around the well extending one foot into the formation from
the wellbore, in which the permeability is of the undamaged permeability.
a What is the total skin factor for this well?
b If the well is reperforated, adding the same type of perforations spf inlong perforations
along the remaining ft of reservoir zone fully completed what is the new total skin factor?
c If the well is originally perforated in the same zone top half of the pay zone to shotsft and
ft long, resulting in a perforation skin of what is the total skin?
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